class_docstr: Base class for EncoderDecoder tests. Tests for specific classes should
  inherit from this and tf.test.TestCase.
docstr: Creates model class to be tested. Subclasses must implement this method.
      
docstr_tok: ["Creates","model","class","to","be","tested",".","Subclasses","must","implement","this","method","."]
code: def create_model(self, _mode, _params=None):
      """Creates model class to be tested. Subclasses must implement this method."""
      self.skipTest("Base module should not be tested.")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  from collections import namedtuple
  import yaml
  import numpy
  import tensorflow
  from seq2seq.data import vocab, input_pipeline
  from seq2seq.training import utils
  from seq2seq.test import utils
  from seq2seq.models import BasicSeq2Seq, AttentionSeq2Seq
label_desc: Use image node_id 3 for calling the EncoderDecoderTests obj's underlying member method code with example usage: obj.create_model(_mode, _params) without return types